1The authors are with Cochin University of Science and Technology, Cochin 682 022, India.
M. Rajesh (rajeshm@cusat.ac.in), M. Sheeba, K. Geetha, P. Radhakrishnan, and V. P. N.
Nampoori (vpnnampoori@cusat.ac.in) are with the International School of Photonics. C. P. G. Vallaban, as well as M. Rajesh, is with the Center of Excellence in Lasers and Opto-Electronic Sciences.

Abstract

The fabrication and characterization of a Rhodamine 6G-doped polymer optical fiber amplifier have been carried out. Two different schemes were employed to characterize the optical fiber: the stripe illumination technique to study the fiber as a gain medium and another technique to study its performance as an amplifier. We observed a spectral narrowing from 42 to
7
nm when the pump energy was increased to 6 mJ in the stripe illumination geometry. A gain of
18
dB was obtained in the amplifier configuration. The effects of pump power and dye concentration on the performance of the fiber as an amplifier were also studied.

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